"An ideal type is formed by the one-sided accentuation of one or more points of view and by the synthesis of a great many diffuse, discrete, more or less present and occasionally absent concrete individual phenomena, which are arranged according to those onesidedly emphasized viewpoints into a unified analytical construct [Gedankenbild]."
Max Weber, The methodology of the social sciences (Edward A. Shils & Henry A. Finch, Trans. & Eds.; foreword by Shils). New York: Free Press, 1997 (1903-1917). p.90.